This generalization refers to the kings of the northern kingdoms. AT: "every king" or "all of the northern kings" (See: [[rc://en/ta/man/translate/figs-hyperbole]])
Possible meanings are 1) this represents ruling over Jerusalem. AT: "will rule at the gates of Jerusalem" or 2) this represents judging Jerusalem. AT: "will judge Jerusalem" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Setting their thrones "against all the walls that surround it" represents commanding their armies to destroy the walls surrounding Jerusalem. AT: "and they will command their armies to destroy the walls surrounding Judah" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# against all the cities of Judah
Setting their thrones "against all the cities of Judah" represents commanding their armies to destroy all the cities of Judah. (See: [[rc://en/ta/man/translate/figs-metonymy]])
# I will pronounce sentence against them
"I will announce how I will punish them"
# I will pronounce sentence against them
"I will pronounce sentence against the people of Judah"
# worshiping what they made with their own hands
Since the people had made the idols with their own hands, they should have known that the idols are not worthy of worship.